超新星中的宇宙射线轰击催生类地行星
Cosmic-Ray Bath in a Past Supernova Gives Birth to Earth-Like Planets
AI总结：
超新星中的宇宙射线核合成通过浸入机制在太阳系形成中扮演关键角色，解释了类地行星的普遍性。
摘要：
天文学中的一个关键问题是类地岩石行星的普遍性如何。在我们的太阳系中，固态行星的形成受到短寿命放射性核素（SLRs）衰变热量的强烈影响，特别是铝-26，很可能来自附近的超新星。然而，当前模型在不破坏原太阳盘的情况下难以重现从陨石分析推断出的SLRs的丰度。我们提出了'浸入'机制，即超新星冲击波中的宇宙射线核合成在超新星距离（约1 pc）处重现估计的SLR丰度，从而保护盘结构。我们估计，恒星团中的太阳质量恒星通常至少经历一次这样的超新星在1 pc范围内，支持了这一场景的可行性。这表明太阳系样的SLR丰度和固态行星形成比之前认为的更为普遍。
英文摘要：
A key question in astronomy is how ubiquitous Earth-like rocky planets are. The formation of terrestrial planets in our solar system was strongly influenced by the radioactive decay heat of short-lived radionuclides (SLRs), particularly $^{26}$Al, likely delivered from nearby supernovae. However, current models struggle to reproduce the abundance of SLRs inferred from meteorite analysis without destroying the protosolar disk. We propose the `immersion' mechanism, where cosmic-ray nucleosynthesis in a supernova shockwave reproduces estimated SLR abundances at a supernova distance ($\sim$1 pc), preserving the disk. We estimate that solar-mass stars in star clusters typically experience at least one such supernova within 1 pc, supporting the feasibility of this scenario. This suggests solar-system-like SLR abundances and terrestrial planet formation are more common than previously thought.
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